Domestic appliance



Feb. 2, 1954 F. H. MCCORMICK DOMESTIC APPLIANCE Filed. March s, i951 5Sheets-Sheet 1 His Attorneys Feb. 2, 1954 F. H. MCCORMICK DOMESTICAPPLIANCE 5 Sheets-Sheet 2 Filed March 5, 1951 H/'s Attorneys INVENToR.Franc/3` H. MC60/mick Feb 2, 1954 F. H. MocoRMlcK 2,668,222

DOMESTIC APPLIANCE Filed March 5, 1951 5 Sheetzs-SheecI 3 F/g a IIAPrINVENTOR. 1513 im vg Franc/'s HMccofm/c/r Feb. 2, 1954 F. H. MocoRMlcKDOMESTIC APPLIANCE 5 Sheets-Sheet 4 Filed March 3, 1951 ISG Feb. 2, 1954F. H. MccoRMlcK DOMESTIC APPLIANCE 5 Sheets-Sheet 5 Filed March 3, 1951Patented Feb. 2, 1954 DOMESTIC APPLIAN CE Francis H. McCormick, Dayton,Ohio,

to General Motors Corporation,

assigner Dayton, Ohio,

a corporation of Delaware Application March 3, 1951, Serial No. 213,721

14 Claims.

This application is a continuation in part of my vccpemzling applicationS. N. 105,105, filed July 16, 1949.

This invention relates to domestic appliances and more particularly toelectric ovens.

My invention is an improvement over previous domestic electric ovens, inthat two independent -and dissimilar cooking operations such as broilingand baking may be performed in the single oven heretofore used ondomestic electric ranges. Also, two independent baking operations, atdifferent temperatures if desired, may be performed in the oven. Also,two independent broiling operations may be performed. Also, whennecessary, my improved oven may be adjusted to receive relatively largeroasts such as fowls which require a relatively large cookingcompartment.

Accordingly, my improved domestic range oven is provided with upper,intermediate and lower heaters arranged to produce two sub-compartmentsclosed by a single common door and adapted to cook foods underindependent conditions. The intermediate heater may be removed from itsintermediate position to provide a single relatively large compartmentcapable of cooking relatively large roasts. The two Sub'- compartmentsare controlled by two independent thermostats, one of which is used tocontrol the single large compartment. The single door is constructed toopen and close both sub-compertinents, and, if desired, means areprovided to close one sub-compartment while partially opening the other.Preferablyl the rupper subcornpartment is arranged for baking, roastingand broiling, while the lower sub-compartment may be used for baking,broiling or warming.

An object of `this invention is to provide an oven having three or morespacedv heaters to produce two or more independent food heating spacestherebetween, with the intermediate heater movable to provide a singlerelatively large compartment.

Another object of thisv invention is to provide an oven Lhaving upper,intermediate and lower heaters for said oven to produce two independentfood heating spaces therebetween, with power'controls for said heaterseffective to produce independent thermostatically controlled cookingconditions in the 'two spacesl when the 'interme- 'd-ia'tehea'ter is inits 'central position, and effective to provide a unitaryI thermostatic`control when the intermediate hea-tenis moved `to provide a singlerelativeiy large compartment.

Another 'object of )this invention is to provide upper, intermediate andlower heaters for an oven 'to produce two ffoo'df heating spacesvthere.

between, with the intermediate heater being movable to a lower positionto produce a relatively large food heating space, capable of receivinglarge articles to be cooked.

Another object of this invention is to provide upper, intermediate andlower heaters, with thermcstatic controls such that the upper space maybe thermostatically controlled independently of the lower space.

Another object of this invention is to provide an oven with upper,intermediate and lower heaters, with the intermediate heater beingmovable from a relatively central position to a lower position adjacentthe lower heater, with thermostatic controls and power connections suchthat a thermostat controls the upper and intermediate heaters andanother thermostat controls the lower heater, the power to the lowerheater being open circuited when the intermediate heater is in the lowerposition.

Another object of this invention is to provide an oven with upper,intermediate and lower heaters and with a door having a closed position,a slightly ajar position, and a fully open position. The door iseffective to close both spaces when in closed position, to close onespace and slightly open another space when in the slightly ajarposition, andr to open both spaces when in the fully open position.

Another object of this invention is to provide an oven having upper,intermediate and lower heaters for said oven to produce two independentfood heating spaces therebetween, and a single door effective to closeboth spaces when in the fully closed position, a means for holding thedoor partially open as is desirable when broiling in the. upper space,and an auxiliary .closure to close the lower of said ytwo spaces whendoor is partially open -to permit baking operations -in the lower spacewhile broiling at the .same time in the upper space.

Another object of this invention is -to provide an intermediate heaterwith Aa resistance element .and a substantially imperforate 'partitionextending below said resistance element substantially throughout thehorizontal extent oi the oven to rform two thermally separated spaces inthe oven,

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings, wherein a preferred form of thevpresent invention 'is clearlyshow-n.

In thewdr-awings:

Fig. 1 is' va vertical cross-section, lalong the Iine i-l of Fig. 2,showing an oven embodying features of my invention;

Fig. 2 is a vertical cross-section taken along the line 2.-2 of Fig. l;

Fig. 3 is a vertical cross-section taken along the line 3-3 of Fig. 1;

Fig. 4 is a vertical cross-section taken along the line 4 4 of Fig. 1;

Fig. 5 is an enlarged cross-sectional View of a power connector for usewith the intermediate heater at its lower position, and showingconnections with the lower heater;

Fig. 6 is a vertical cross-section along the line @-6 of Fig. 5;

Fig. '7 is a vertical cross-section along the line 1 1 of Fig. 5;

Fig. 8 is a wiring diagram showing the connections and controls for theheaters;

Fig. 9 is a view similar to Fig. 4, showing additionally the baillewhich may be used above the resistance;

Fig. 10 is a front view with the door open of an oven showing a modiedform of my invention;

Fig. 11 is a vertical sectional view of the oven shown in Fig. 10 withthe shelf supports omitted for clarity;

Fig. 12 is a sectional view of the intermediate independent heating unittaken along the line |2--l2 of Fig. 10;

Fig. 13 is a sectional view taken along the line |3-l3 of Fig. 12;

Fig. 14 is a view of the oven with intermediate independent electricheating unit in its lower -position providing a single full-size ovencornpart-ment;

Fig. 15 is a fragmentary enlarged vertical sectional view particularlyshowing the inner subdoor for independently closing the lowersub-compartment;

Fig. 16 is a sectional View taken along the line lB-l of Fig. 10;

Fig. 1'7 is an enlarged sectional view of the intermediate heating unittake along the line I'l-l'l of Fig. 16.

Fig. 18 is a fragmentary sectional view taken alo-ng the line lili3 ofFig. 1'7;

Fig. 19 is a fragmentary sectional view taken along the line l--IS ofFig. 18;

Fig. 20 is a front view of the intermediate heating unit arranged forbroiling;

Fig. 21 is a side View of the intermediate heating unit arranged forbroiling;

Fig. 22 is a fragmentary vertical sectional View of the front part ofthe oven showing another form of the inner sub-door; and

Fig. 23 is a view similar to Fig. 20 showing another form of innersub-door.

My invention may include an oven lll, having upper, intermediate andlower heaters il, l2, and i3, respectively, to form food cooking spacesor sub-compartments ll and l5 above and below the intermediate heater.These food cooking spaces M and l5 are capable of maintaining differenttemperatures and different conditions of heating, so that baking,broiling and/or warming may be accomplished simultaneously andindependently within the two cooking spaces in the oven.

The intermediate heater l2 is movable from a relatively centralposition, as indicated in full lines in Fig. 1, to a lower position l2',as indicated in dotted lines in Fig. 1. The lower position preferably isadjacent the lower heater i3, to form a single large compartmentsubstantially equal in volume to the previous separate compartments i4and i5, and capable of roasting a large turlrey or the like.

Power connectors i6, l?, it, and IS are provided. Connectors i6 and l@provide power for the upper and lower heaters Il and i3 respectively.They may be of any suitable bayonet type which allow the heaters to beremoved for cleaning, repairing and the like. The connectors il and lare somewhat similar to connectors IG and i9; but are provided withmeans effective to allow all. three heaters to be energized when heateri2 is in its relatively central position, and effective to energize onlythe upper heater l l and `the intermediate heater l2, and to disconnectlower heater i5, when the intermediate heater is in its lower position.

In order to allow the intermediate heater l2 to control the connectionsto the lower heater i3, the connector ES may be constructed as shown inFigs. 5, 6 and '7, and may include the power line bayonet slots 2@ and2l and the neutral bayonet slot 22. The slots 2@ and 2l may be connectedto the power lines L1 and L and receive the power prongs 2t and 2i ofheater li while the connestor 22 may be connected to the neutral wire orto ground as is usual and receives the ground .prong 'riti of the heateri2. ln addition, the neutral connector 22 is provided with an insulatedopening 23 through which the extension 24 of the heater ground prong 25may project. The extension 2li is adapted to engage an insulated cap 2tof a switch blade 2l, and to open the contacts 2S, which are adapted toclose when the prong 25 is removed. Thus the lower heater isdisconnected at contacts 2S and 2Q when the intermediate heater is inits lower position; but is connected when the intermediate heater isremoved from its lower position.

One of the prongs Bil of the lower heater i3 is connected to the line Lthrough the medium of bayonet slot 3l, thermostat contact ft2, and line3l. The other prong 352 is connected to the line L, through the bayonetslot 33, thermostat contact 42, line 3G, contacts 2Q, 28, blade 2l andline 3E. Thus, when the heater l2 is inserted in the connector il?, thepower connection to the lower heater i3 is broken by the opening ofcontacts 2li and 2li; but when the heater i2 is removed from theconnector i3, and is inserted in the connector il, the lower heater i3is connected to the power line L1 by the closing of contacts 28 and 29.

The lower heater i3 is controlled by a thermostatic switch 4@ which mayinclude the usual snap-acting mechanism ill capable of opening andclosing the contacts l2 in response to temperature variation wit-hin thespace iii. These varia-tions act upon the bulb 4&3, connected by thetube fill with the snap-acting mechanism l l, as is well lrnown. Themechanism il may be adjusted by the knob 55, capable of adjusting themechanism to be responsive to various temperatures, as selected by thesetting oi the lrnob and capable of maintaining the contacts t2 fullyopen in the off position, regardless of oven and room temperatures.

Thermostatic means 5t for controlling the temperature within the spacelll may also be provided, and this may include a thermostaticconstruction substantially identical with that disclosed in patent to M.Fry, No. 2,388,839, granted November 13, 1945. Briefly statedy it l mayinclude a thermostatic bulb 5l connected by tube 52 to a diaphragm orbellows 53, which be; ediusted; by means of; knob; con footed. to

a shaft 51 which ,has Ulla-1516er@ 3 axially4 Theknobrfimarinai/eau foiiposition, a

l?? position., and plurality of; temeerature loositions, .which are-thebake positions.' The bien broi esti temperature is,k the, breilposition. Ther Shaftsifis, provided withv seleotoreems 55 and tiwhohonen;v and-close; the` contacts et? and 6A; aoproner; settings. of. theknob, 5t'. intheofff positioncontactsii, Stand 54. are open. Inthebroil?position contacts Eil and dal; are closed,I anclgfcontacts Siljareopen;l This energizes the upperheater Il atiull capacity, as,describedin-theizl'ry patent; If the knob 56 is turned to any;-off-they tempera-turev positions, excepty thev broiliposition, the;vcontacts ,5,41 and,` et: are closed, andthe contacts di, are open,thiisI energizing thev intermediate heater i2 at* fullcapacity,andtheupper; heater iiatv reduced output, the-se heaters beingsubsequently cycled by the thermostatic opening and; closing of thecontacts inrresponse to temperatures acting on the bulb ill; Ii the knobii'is first turned to breil; then backito some baking position, theupper hea-ter ii;- and intermediate heater I2 are both energizedV atVfull capacity until the space Ulrreaches the desired temperature. Thisis accomplished by thepclosingfofi contacts Sl'and di inthe broilposition, the contacts 65| `being maintained closed by the holdingsolenoid' (i521` after the knob isfmoved to the bake position, thecontacts being closed in the bake position. Therefore, for` one heatingcycle, both heaters i! and i2" are at full capacity, the cycle being4terminated by the opening of contacts 54, which opening de. energizesthesolenoid S2 and allows the heater Hthereaiter to be re-energizeol atreduced cutput, withthe other heater at full capacity, as. moreifullydescribedin the Fry. patent.

When the intermediate heater IE is. removedY from its. central position,and inserted inits lower position, the prong moves the switch blade Zitoopen position, thus disconnecting the lower heater i3 from the powerline L1. rThe thermostat 555. continues to control the intermediateheater I2 exactly' the same as it didin its central position, by virtueof the lines and 551 which connect the slots and? ttc the thermostaticcontrol 5@ exactly the saine as the lines el and lnfconnect the bayonetslots 2t and 2i ofthe intermediate connectorv il.

Preferably the intermediate heater l2 is provided with an imperioratepartition l@ extend--v ing below the resistance element li substantiallythroughout the horizontal extent of the oven, to form the twosubstantially thermally sepav rated-spaces, Ilia-nd i5. Someslightopening (not shown) may be provided inthe partition'ie which isonly/sufficiently large to allow thevapors to flow through said` openingfromthe sub-cornpartmentV l5 tc the sub-compartment le, from whencethey7 may ilow through the vent l2, which vents may be of ther usualconstruction. Thisv opening should not be suiiiciently large to provideany substantial thermal exchange.

Ifdesired, the intermediate heater i2 may be providedyfith adistributing baille above the resistancel element l! as indicated inFig. 9, which baffle may be substantially-identical'with the baiiie eddisclosed in my Patent 2,314,592, gra-nted'March 23, 1943;

Theheaters may be supporteclfby` any suitable IneensT1msthetupperrheater- Il; mer-include;

lonsitu lfitvrh-ie.V i. The interinedi'ate-: heater l2.;

g Wirei bars. 144i Sliolalole; in; brackets.- n. oil the ovenf.

'avloe`v supported oli-various. Shelf sachets l.lli:fornirci inthesides;

Off the:4 overt. for;y reception; of.l Shelves, heaters, andthelilre,these.beinefproneriy loca-ted; for receptie of the? heater; i2 both its:Central and lower. positie The lower heater; 1.31 be: slidablySupported. onrlone-itudinal brackets.4 11:.

The.. uriner; heater be niovilied..fvvith a reiieotor lli,l torefieot.theirays Vflor/11Wordiy.

The lower heetecmeyf loefforrriechofV an outer.1

tube 'I9 within which is placed the; resistance; 3.0 emboddest` inivrannioted .v insulation, a Well known; construction.

The door 8l hasa fullyclosedpolsition, aslighta lyajarfposition and, afully open position. The mounting, hinging'and.; supporting of thedoormay be, or; anyfwell knownconstruction, forex.- ample, suchasis-disclosedirimy Patent 2,30%;768, grantedqJune 19,` 1943.- Thedoorlining maybe provided-'with a. bulgingportion 832A providing; avsub-door adapteolto .cooperate with the front lip` ofv the partition1810i; the` heater l2 in such aimanner that; whenAv the door isin theslightly ajar position, as,illustrated. inFig. 1-the sub.- compartmentIgis;.substantially closed, while theA sub-coinpartmentI I 411smaintainedslightlyv open.

le. may. beused: for,` broiling, andthe temperature within*4thefsubecornpartment isY thus preventedrcm. rising suncientlyto cyclethecontacts ell. Attheisametime the. sub-compart-` ment i5 maybe-.usedzfor baking orwarrning, because oititssubstantiallyclosed-condition, pro. duced by the sub-door bulge 82 and lipl83; Whenthe door Sil: is inits fully. openv position, which may beAsubstantially-horizontal; both subcompartments, I4 and. l5zare fully;open, as. is. evident. Whenthe.` door.- 851e is in its fully closedposition, with itsupper part substantially against` the upper edge .ofthe; oven, then both sub-compartments I4 and. I5-L are'substantially'closed, under which conditions eithervor bothoi-ftheisub-A compartments. may.v bei used .foreither baking` orwarm-ing, as desired-.1 The. sub-.door bulgingportion 132extendslaterally substantially from one side.- wallof1the oven to theother side wall, to substantially seal4 the sub-compartinent I5 whenthedoor is-slightly ajar.`

In the operation offmy invention, if it is desired to broil inthecompartment. I4; while si. multaneously baking and/orfwarming-in thesubcornpartment i5, with` the=.intermediate heater in central position,`the knob 56.k is turned to broilgv and.; theknob` 45; is; turned. to thedesiredhakingor warming.` temperature. The article to be broiledzisplacedA on a shelf (not shown) within the sub-compartment le, whilethe -article tov be baked-isplacedon a'shelf (not shown) withinthecompartment l5a The door 8i is placed-inthe-slightly ajar-positionjas shownin Fig; l. Iffit is desiredto remove` or-vinsert articles ineither-of thecoinpa-rtments I4 orv i5, thedoor 8i is'placed inA itsfully open position; Ii it: is; desired to balrefand/orfwarrnY in bothof the sub-compartments 1 4 and I5, the knobs Se* and 45. are'- adjustedv to the desired baking conditions, articles 'arefpla'ced in bothsub-com-A partments Id 'and l5, andrthey doorl is placed initsfully,closed position-.-

Should itbe desiredto cookavery-large article; the intermediate. beatenl 24 is; movedk toits lower posit-ion` toprovideL a` single; fullf.size.- oven com;-

partment, and the knob 56 is adjusted to the desired condition. Thearticle is supported on proper shelving (not shown) at the desiredelevation, and the door 9| is placed either in the slightly ajarposition shown in Fig. 1, for broiling or in the fully closed positionfor baking, roasting or warming, the notch 04 in the door permitting itto be fully closed without abutting against the lip 33. Under suchconditions heaters and l2 are controlled by thermostat 50.

A companion application for Domestic Appliance, S. N. 105,106, filedJuly 16, 1949, now abandoned, shows and claims a modication of thisinvention.

This application is similarly related to S. N. 218,413, nled March 30,1951, which is a continuation in part of S. N. 105,106.

It is obvious that either of the sub-compartments I4 and i5 may be usedalone, without using the other sub-compartment, if desired.

Referring now more particularly to Figs. 10 and 11 there is shown anoven |30 provided with a broil type top independent electric heatingunit |32 supported upon the shelf supports |33. A removable intermediateindependent electric heating unit |34 is supported upon the shelfsupports |36 and a bottom independent electric heating unit |33 issupported upon the shelf supports |40. In the position shown in Fig. 10the intermediate heating unit |34 divides the oven |30 into an uppersub-compartment |42 and a lower sub-compartment |44. As shown in Fig.14, the intermediate heater |34 is removable from the position shown inFigs. 10 and 11 and is inserted into the lower position shown in Fig.14, where it rests upon the shelf supports |46.

Terminal connectors |43, |50, |52 and |54 are provided upon the backwall |53 of the oven |36. These connectors are similar to the terminalconnectors I6 to I9 inclusive of Figs. 1 to 9 and connect to anelectrical energizing circuit like that shown in Figs. and 8. When theintermediate heating unit |34 is moved from the position shown in Figs.and l1 to the position shown in Fig. 14, it is disconnected from theterminal |50 and is inserted into the terminal |52 which is made likethe terminal i8 in Figs. 1 to 9 so that the bottom heating unit |38 isdeenergized` as provided for in Fig. 8. However, if the combined heatingeffect intermediate heating unit |34 and the bottom heating unit |38 isnot excessive, it may not be necessary to deenergize the unit |36.

The bottom heating unit |38 may be of the tubular sheathed type. The topheating unit |32 and the intermediate heating unit |34 are of the opencoil type similar to that shown in Figs. 1 to 9. A broil pan may beplaced immediately beneath the top unit |32 for broiling.

To make it possible to broil in the upper subcompartment while the lowersub-compartment is in use for baking, there is provided beneath theheating unit |34 a sheet metal partition |56 and connected to thepartition is a pull-out and folddown type of drop sub-door |58. Theintermediate heating unit |34 is provided with a heavy rectangular wireframe |60, the edges of which rest directly upon the side shelf supports|36. The frame |60 is provided with pairs of longitudinal wire members|62 and |64. Each of these pairs of wire members support a plurality ofinsulating spools |66 through which extend a continuous coiled bareelectric heating wire |68. This heating wire is connected in theterminal block |10 to the prongs |12 which provide the connection withthe terminal blocks |50 and |52. The terminal block |10 is provided witha channel supporting member |14.

Extending over the heating wire |68 is a substantially flat baie |16provided with iianged central opening. This baiiie |16 preferably issimilar to the baile 60 disclosed in my Patent 2,314,592, granted March23, 1943. The front edge of the baffle |16 is folded downwardly andrearwardly to provide a front face |18 which en closes and rests uponthe front end of the wire frame |60. The rear end of the baffle |16 isfastened to the terminal block |10 by the wing nut |80. The sheet metalpartition |56 rests upon the in-turned ledge upon the front face |18 ofthe baffle |16 and the in-turned ledge provided upon the rear channelsupporting member |14. The head |02 of the main screw extending throughthe terminal block |10 is received within an aperture in the sheet metalpartition |56 to prevent lateral movement of the partition |56.

Preferably, the partition |56 is placed upon the ledge of the channelmember |14 and over the head |32 of the screw extending through theterminal block |10 before the bafe |16 is placed in its position overthe wire frame |60 with its ledge beneath the front edge of thepartition |56 and secured to the terminal block |10 by the wing nut |80.The partition |56 is provided with reinforcing ribs |51 the front endsof which engage the projections |59 extending rearwardly from bracketsfastened to the front edge of the wire frame |60 to insure centering andto prevent shifting of the partition |56 relative to the wire frame |60.The rear or upper edge of the inner drop sub-door is provided with achannel shaped bracket |84 which rests on the opposite side edges of thesheet metal partition |56. The coniiguration of this bracket |84 isbetter shown in Figs. 18 and 19 and particularly includes a projection|86 which rides upon the opposite side edges of the sheet metalpartition |56. The front face |16 is of slightly lesser width than thesheet metal partition |56 permitting the flanged portion |30 to pass theedges of the front face |16 so as to allow the door |58 to be foldeddown to the position shown in Fig. 15.

The operation of this door is similar to that in most sectionalbookcases in which the door pulls out horizontally and then folds down.To return the door to the position shown in Fig. 11, the handle |90 islifted up until the door |50 is horizontal and then is pushed back untilthe handle |90 can be inserted into the aperture |92 provided for it inthe front face |16 of the baffle member |16. When the door |56 is in itslower position, it effectively closes the lower sub-compartment |44.

The oven is provided with a single horizontally opening common outerdoor |94. The mounting, hinging, and supporting of the door may be ofany well known construction, for example, as disclosed in my Patent2,308,768, granted June 19, 1943. The door, as illustrated in saidpatent, has a partly open station for broiling purposes as illustratedparticularly in Fig. 1l. This permits the upper compartment |42 to beused for broiling purposes while, if the door |53 is pulled down asshown in Fig. 15, the lower sub-compartment |44 may be used at the sametime for baking purposes.

For the purpose of providing satisfactory independent controls for eachsub-compartment the upper sub-compartment |42 is provided with:thermostat |96 corresponding to the in Figs. 1to19while-thellcwerfsubcompartmentilit is provided witha thermostat |98corresponding to the thermostat'bulb `43 in Figs. 1 to 9.

When it is desired to use both compartments for baking the single outerdoor I-S is vrnovedto the closed position shown in dot-dash lines inFig. 11 and-in'full lines in Fig. 16. It isnot-necessary that the dropsub-door `|5ii-be moved'tothe position shown in Fig. l5 vforthis-'operationbut the independence of the two sub-compartments Will lbeimproved by lowering the doorlt. When a thermostat bulb vit Yis desiredto use the oven as a large single compartment oven, the intermediateheating-unit |34 is moved `to Vthe position shown in Fig. 14. Asmentioned before, in accordance with "the arrangements shown in Figs. 1to 9, this l,will de energize the lower heating unit It andthe heatingwill be rperformed principally by the intermediate heating unit i3@ witha small amount of top heat being provided by the top broil unit |34under the control of the thermostat bulb |96.

If it should be desired'to broil in both the upper sub-compartment Miiand the lower sub-compartment i436 at the same time, `the partition IE6and the door |55) may be removed from the intermediate heating unit |32.Thesheet metal partition |53 is then placed on the shelf guide 2li!immediately above the intermediate position of the intermediate heatingunit |34 as shown in Figs. 20 and 2l. A broil pan EBS is placed upon theshelf guides 2st immediately beneath the intermediate heating unit ISd.A breil pan is also placed immediately beneath the top broil unit its asis customary. With this arrangement, broilingcan be accomplished in both.compartments simultaneously.

In Fig. 22 there is provided a door arrangement in which the innersub-door Zei is pivoted upon the same pivot pins as is provided for thesingle common outer door ist. This inner subdoor Zl may rest against thefront face oi the intermediate heating unit It. to effectively close thelower sub-compartment |44. When the intermediate heating unit |34, isplaced in its lowermost position as illustrated in Fig. lli, the innersub-door 2t? may be in contact with the inner surface of the singlecommon outer door |34.

In Fig. 23 the inner sub-door 292'? is fastened directly to the frontedge of a shelf member 2i! which is supported upon a pair oi' shelfguides 2|3. This sub-door 2539 cooperates with the intermediate heatingunit i3das well as the walls of the oven compartment to substantiallyciose the oven compartment hifi in the same manner as the doors 2&3?,|58 and the sub-door 32.

While the form of embodiment of the invention as herein disclosed,constitutes a preferred form, is it to be understood that other formsmight be adopted, as may come within the scope of the claims whichfollow.

What is claimed is as follows:

1. In combination: an oven; upper, intermediate and lower heaters forsaid oven having two food heating spaces therebetween; and a door havinga closed position, a slightly ajar position and a fully open positionand extending as a rigid continuous impervious unit over the entirefront of both spaces for substantially closing both of said spaces whenin closed position, and having means for substantially closing one ofsaid spaces while maintaining slightly open the other Of said spaces inthe slightly ajar position, and

for maintaining open both of'saidspaces'isaid fully open position.

2. In combination: an oven; upper, intermediate and lower heaters forsaid vovenhaving two food heating spaces therebetween; a door fforopening and closing said spaces having a/closed position, a'slightlyajar position and a fully open position; one oisaid heaters and saiddoor ihavfing means lfor substantially closingione-of said spaces whilemaintaining *slightly openthe 'other of said spaces lwhen said door islin slightly ajar position; said door substantially fully/closing'andfully opening said spaces in the closed and ffuily open positionsrespectively. A

3. An oven including walls enclosing" anove'n compartment, a horizontalpartition means 'with'- in said compartment intermediate thetlo'p andbottom dividing said compartment into 'upper and lower sub-compartments,door meansincluding va common door lextending as a single 'rigidimpervious continuous unit over vthe entire -iront of the compartmentfor closing the entire `conrpartment and having a partly open stationyfor broiling purposes, said door means including means for closing onlyone of said sub-compartments while said common door is -in said partlyopen station.

4. An oven including walls enclosing an oven compartment, a lhorizontalpartition ymeans with"- in said compartment intermediate the ytop 'andbottom dividing said compartment into upper and lower sub-compartments,door means including a common door for closing the rentire comparte mentand having a partly open station for broiling purposes, said common doorhaving a `bulge formation forming a sub-door cooperating `with thepartition means and the walls for substantially closing one of saidsub-compartments 'when in said partly open station.

5. An oven including an oven compartment, upper and lower electricheating means for lsaid compartment, a removable horizontal partitionmeans for dividing said compartment into lupper and lowersub-compartments, an outer 'door for opening and closing the entire ovencomparte ment, and a movable inner door cooperating with said partitionmeans and extending over Vonly a part of the entrance to said ovencompartment for opening and closing vonly one of said subcompartments.

6. An oven including an oven compartment, upper and lower electricheating means for Isaid compartment, a removable horizontal partitionmeans for dividing said compartment into 'upper and lowersub-compartments, an outer 'door for opening and closing the entire ovencompartment, and a movable inner door cooperatir'i'g with said partitionmeans and extending over only a part of the entrance to said ovencompartment cooperating with said partition means for opening andclosing only said lower sub-compartment.

7. An oven including an oven compartment, upper and lower electricheating means for said compartment, a removable horizontal partitionmeans for dividing said compartment into upper and lowersub-compartments, an outer door for opening and closing the entire ovencompartment, and an inner door of the slide out and drop down typeextending over only a part of the entrance of said oven compartment andcooperating with said partition means for closing only said lowersub-compartment and retractable horizontally beneath the partition meansto open the lower sub-compartment.

8. An oven including an oven compartment, upper :and lower electricheating means for said compartment, a removable horizontal partitionmeans for dividing said compartment into upper and lowersub-compartments, an outer door for opening and closing the entire ovencompartment, and an inner door extending over only a part of theentrance of said oven compartment and having its upper edge portionslidably and rotatably mounted upon said partition means so as to slideout and fold down to close only said lower sub-compartment, said innerdoor having means for supporting its lower edge portion upon saidpartition means to support said door parallel to said partition means.

9. An oven including an oven compartment, upper and lower electricheating means for said compartment, a door for closing said ovencompartment, a removable intermediate heating means having anintermediate location between the upper and lower heating means, amovable horizontal partition means for dividing said oven compartmentinto upper and lower sub-compartments, and a retractable outwardly anddownwardly independently movable inner closure for only said lowersub-compartment movable outwardly and downwardly irom open to closedpositions independently of said door.

10. An oven including an oven compartment, upper and lower electricheating means for said compartment, a door for closing said ovencompartment, a removable intermediate heating means having anintermediate location between the upper and lower heating means, amovable horizontal partition means for dividing said oven compartmentinto upper and lower sub-compartments, and an inner closure for saidlower subcompartment pivoted to said door and movable to open positionwhen said door is fully open and to close position when said door ispartly or fully closed.

11. An oven including an oven compartment, upper and lower electricheating means or said compartment, a door for closing said ovencompartment, a removable intermediate heating means having anintermediate location between the upper and lower heating means, amovable horizontal partition means, and means for supporting saidpartition means in horizontal position alternately immediately above orbelow said intermediate heating means to divide said oven compartmentinto sub-compartments, and an inner door smaller than said rst mentionedoven compartment door cooperating with said partition means for closingonly one of said subcompartments.

12. An oven including walls enclosing an oven compartment, an upperheating means within said compartment primarily for broiling, a lowerheating means within said compartment, an intermediate removable heatingmeans having a horizontal partition means associated with it dividingthe compartment into upper and lower sub-compartments, door meansincluding a common door pivoted adjacent its lower edge eX- tending as asingle rigid impervious continuous unit over the entire front of thecompartment and having a partly open station for broiling with the upperheating means in the upper subcompartment, said door means includingmeans cooperating with said horizontal partition means for closing saidlower sub-compartment when the common door is in said partly openstation.

13. An oven including an oven compartment, upper and lower electricheating means for said compartment, a door for closing said ovencompartment, a removable intermediate heating means having anintermediate location between the upper and lower heating means, amovable horizontal partition means for dividing said oven compartmentinto upper and lower sub-compartment, and an independently movable innerclosure having an area substantially equal to the area of the opening ofsaid lower sub-compartment for closing only said lower sub-compartment,said inner closure being movable to open and closed positionsindependently of said door.

14. An oven including an oven compartment, upper and lower electricheating means for said compartment, a door for closing said ovencompartment, a removable intermediate heating means having anintermediate location between the upper and lower heating means, amovable horizontal partition means for dividing said oven compartmentinto upper and lower sub-compartments, and a removable inner closurehaving an area substantially equal to the area of the opening of saidlower sub-compartment for closing only said lower sub-compartmentremovable t0 open and restorable to close said lower sub-compartmentindependently of said door.

FRANCIS I-I. MCCORMICK.

References Cited in the le of this patent UNITED STATES PATENTS NumberName Date 1,208,213 Richmond Dec. 12, 1916 1,209,326 Nye Dec. 19, 19161,355,868 Trenkamp Oct. 19, 1920 1,375,801 Ross Apr. 26, 1921 FOREIGNPATENTS Number Country Date 117,996 Great Britain Aug. l5, 1918 600,388Great Britain Apr. '7, 1948

